Measurement of Angular Velocity, Angular Acceleration and Twist Angle during Twisting Pendulum Motion in Sports Using Accelerometers and Gyroscopes

Twisting pendulum motion appears frequently in sport movement. To illustrate the measurement systems to the motion, we propose a rigid body 2-link model as follows : the second link which is shaped cylinder is connected to the first link with joint, and the second link is covered with slide guide and rotating cylindrical surface. In this paper, twist angle is defined as the rotating angle of the surface from the joint axis. The measurement of angular velocity, angular acceleration and twist angle of the second link surface during rotating motion about the joint axis are performed by using 4 accelerometers and gyroscopes fixed to the surface.